<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>p9简易计算器</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.js"></script>
</head>
<body>
    <div id="app">
        <input type="text" v-model="n1">
        <select v-model="opt">
            <option value="+">+</option>
            <option value="-">-</option>
            <option value="*">*</option>
            <option value="/">/</option>
        </select>
        <input type="text" v-model="n2">
        <input type="button" value="=" @click="comput">
        <input type="text" v-model="result">
    </div>
    <script>   
        var vm=new Vue({
            el:"#app",
            data:{
                n1:0,
                n2:0,
                result:0,
                opt:"-"
            },
            methods:{
                comput(){
                //    switch(this.opt){
                //        case "+":this.result=this.n1+this.n2;
                //        break;
                //        case "-":this.result=this.n1-this.n2;
                //        break;
                //        case "*":this.result=this.n1*this.n2;
                //        break;
                //        case "/":this.result=this.n1/this.n2;
                //        break;
                //    }
                var shizi=this.n1+this.opt+this.n2;
                this.result=eval(shizi);
                }
            }
        })
    </script>
</body>
</html>